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Photochemical reaction light source

There are many examples of light sources used in chemical and chemical production, some of which are photochemical synthesis, polymerization reactions, and some are photochemical decomposition reactions.

1. Using ultraviolet light from a high-pressure mercury lamp to convert 7-dehydrocholesterol into vitamin D:. The conversion amount is kept in the range of 30~50%.

2. Producing monomers of caprolactam-nylon by photochemical method

During the production process, the reactor is close to one side of the lamp; the problem that may be encountered is the deposition of hydrochloride salts of oximes, which weakens the effective light utilization intensity of the lamp and reduces the overall efficiency. It has been found that the growth rate of the deposit depends on the wavelength of the light, in order to avoid the interference of "stray light". Therefore, a thallium lamp with a specific peak wavelength of 535nm is used. If some thorium spectral lines are added to the thallium lamp, the effect will be better.

3. The application of photochemical reactions in the synthesis of heterocyclic compounds has been used to synthesize potential antibiotics related to penicillin.

4. It is very meaningful to use photochemical decomposition reaction to eliminate pollution

When synthesizing polyvinyl chloride (PVC), its monomer vinyl chloride (VC) is easy to cause cancer when the concentration in the air is high. Therefore, ultraviolet light source is used to irradiate and decompose vinyl chloride. If there is VC10~10000ppm in the air, 100W high-pressure mercury lamp is used to irradiate for 15min (minutes) to completely decompose VC. The product is C0, and HC1 can be absorbed by NaOH solution.

According to data reports, if there is aflatoxin in peanut oil, the carcinogenicity rate is high. It can be irradiated with ultraviolet light source 3650A (high-pressure mercury lamp) to destroy aflatoxin and protect human health.